Multiple tube forced-draft and air flow air heater



G. l. CARTER MULTIPLE TUBE FORCED DRAFT INVENTOR.

ATTORNEY.

AND AIR FLOW AIR HEATER Filed Dec. 4, 1944 June21, 1949.

Patented Jime 21, 1949 MULTIPLE TUBE FORCED-DRAFT AND FLOW AIR HEATER George Irving Carter,

assignor to Harvey-Whipple, Incorporated, Springfield, Mass., a corporation of Massachusetts Longmeadow, Mass" Application December 4, 1944, Serial No. 568,548

3 Claims.

This invention relates to improvements in heating apparatus and is directed more particularly to improvements in hot air heating apparatus for buildings.

The principal objects of the invention are directed to the provision of hot air heating apparatus that is not only simple and compact in form but is eflicient in its operation.

According to novel features of the invention, hot air is provided under relatively greater velocity than is the case with prior art apparatus,

thereby making it possible to conduct the air' through relatively smaller ducts than are ordinarily used. It is also possible to extend smaller duets with greater facility through floors, partitions, and the like, and to use flexible ducts to enhance ease in installation.

Various novel objects and advantages of the invention and various novel features of construction will be observed in connection with the following description of the invention, it being understood that various changes and modification-s may be made without departing from the spirit and scope of the invention.

In the drawings:

Fig. 1 is a partial sectional elevational view through a building having the novel features of the invention associated therewith; and

Fig. 2 is an enlarged sectional plan view on the line 2-2 of Fig. 1 to explain certain novel features of construction.

Referring now to the drawings more in detail, the invention will be fully described.

The side walls, floors and partitions 2, 4 and 6, of a building are shown to provide separate rooms. A stack or chimney is represented by 8 which may be of usual form.

The heating apparatus of the invention is represented by l0. There may be one such apparatus on the upper floor for heating the upper rooms and another suspended by the lower floor for heating the lower rooms. This will be desirable in some cases as it is thereby possible to provide relatively short hot air conduits or ducts for the upper floor rooms.

Only one heating apparatus such as I will be described since they may be similar in all important respects.

From the heating apparatus there extends a flue l2 that is connected to the stack 8. Around the flue there is an elongated hot air compartment or chamber I4 which may be of any length and may, of course, be insulated if desired.

Hot air is conducted from the chamber [4 by means of ducts 16 to heat distributing means l8.

2 Such means l8 may take any form uesired such as radiators or the like, and they do not form a part of the invention other than to distribute heat and need not be described more in detail. The ducts I8 may be of any number and lead to any form of heat distributor desired. The ducts l6 will preferably be tubular in form and of a flexible nature so as to be readily insertable through floors, partition walls, and the like. Due to the novel characteristics of the apparatus the gluczs I6 may be relatively smaller than prior art no s.

As shown, the heating apparatus Ill below the lower floor may be suspended by hangers or brackets 20 so that the apparatus will lie closely to the floor above and not occupy basement floor space as is usual with ordinary apparatus.

A platform 22 of the apparatus supports a motor 24 to the shaft of which are secured a circulating fan 26 and a fan 28 for supplying air for combustion. The fan 26 is rotatable in a housing or passageway 30 which has an inlet opening 32 leading thereinto. The air passageway 30 leads to an air chamber 40 from which extends the elongated chamber or duct l4 already referred to.

There may be a casing represented by members 42 and 44, providing a compartment 46. Air filtering means may be disposed in the compartment 46 so that air is filtered before it is directed into the chamber 40 by the fan 26. The filtering means may take any form desired.

A cylindrical shell 48 has end walls 50 to provide a combustion chamber in the compartment 40. Tubes 52 extend between the end walls 50 which have their ends opening into the chamber 40.

A housing formed by walls 54, 56 and 58 encloses the fan 28 and a tube 60 connects the wall 56 and one wall 50 of the combustion chamber as it extends through the air chamber. A tube 62 is disposed in the tube and a fuel oil conduit 64 extends inwardly thereof from a flange 66. A fuel nozzle 68 is associated with the conduit 64. Spark plugs, not shown, extend into the tube 62 for igniting atomized fuel delivered by the nozzle.

The housing around fan 28 provides means for directing air into the tube 62 through an opening 63 therein which is variable. This housing and air control means are similar to that shown in my pending application Serial No. 561,396 filed November 1, 1944 which has matured into Patent No. 2,433,317, dated December 23, 1947. A tubular construction 66, preferably of refractory ma- 3 terial, is disposed in the combustion chamber at the open end of tube 62.

With the motor 24 in operation, air is delivered in the amount desired to the tube 82 while fuel oil is discharged by the nozzle 08 in the atomized state desired and necessary for combustion. Combustion takes place in the combustion chamber to heat the walls ll and Ill and the tubes 82, while hot gases pass outwardly through the flue to the stack, heating of course said flue l2.

Air flows by action of the fan 26 into the chamber 40 past the wall 48 and through the tubes 52 into the elongated chamber I4 and past the flue II. To insure the desired heating of air in the chamber 40 there is a restricted passageway I8 which causes the desired portion of air to pass through the tubes 52. Thus air not only flows past the walls of the combustion chamber but through the tubes as well, thereby to bring about the most eiilcient heat transfer.

The fan 26 is of such characteristics and is operated in such a way that heated air attains a considerable velocity or pressure not only to provide a large quantity of heated air, but also to provide heated air promptly following the beginning of a cycle of operation. The quick heating ability of the apparatus makes it possible to supply heat to the rooms within a very short interval of time, and it is possible to employ the relatively small ducts [6 since the volume of heated air supplied is relatively greater than has been possible heretofore.

Various changes and modifications may be made in the form of the invention or the relative proportions of the various components may be varied to adapt the construction to various uses without departing from the spirit and scope of the invention.

What it is desired to claim and secure by Letters Patent of the United States is:

1. Heating apparatus for securing to the ceiling comprising in combination, connected together adjacent and opposite side and end walls forming an air chamber, connected together adjacent and opposite side and end walls within the said chamber spaced from the walls thereof forming a horizontal combustion chamber and an air space therearound, an outer air flue extending from one end wall of the air chamber and an inner flue therein and spaced therefrom extending from an adjacent end wall of the combustion chamber forming an air space between said flues leading from said air chamber, an air tube for a fuel nozzle extending through the other end wall of the air chamber and through the air space into an adjacent end of the combustion chamber and having an outer end spaced outwardly from the other end wall of the air chamber, a plurality of horizontal tubes extending between opposite end walls of and passing through the combustion chamber having open ends in communication with said air space, and means for delivering air to the air chamber, and

separate means for delivering air to said air tube.

2. Heating apparatus for securing to the ceiling comprising in combination, connected together adjacent and opposite side and end walls forming an air chamber, connected together adjacent and opposite side and end walls within the said chamber spaced from the walls thereof forming a horizontal combustion chamber and an air space therearound, an outer air flue extending from one end wall of the air chamber 4 from extending from an adjacent end wall of the combustion chamber forming an airspace between said flues leading from said air chamber, an air tube for a fuel nozzle extending through the other end wall of the air chamber and through the air space into an adjacent end of the combustion chamber and having an outer end spaced outwardly from the other end wall of the air chamber, a plurality of horizontal tubesextending between opposite end walls of and passing 'through the combustion chamber having open ends in communication with said air space, connected together walls forming a first housing at a side of the air chamber and a duct leading therefrom to a side of said air chamber adjacent said other end wall thereof connected together walls forming a second housing spacedoutwardly from the first housing and a duct leading therefrom to the outer end of the air tube, and

means for forcing air through said ducts into the air chamber and air tube.

'3. Heating apparatus for securing to the celling comprising in combination, connected together adjacent and opposite side and end walls forming an air chambe'r, connected together adjacent and opposite side and end walls within the 1 said chamber spaced from the walls thereof forming a horizontal combustion chamber and an air space therearound, an outer air flue extending from one end wall of the air chamber and an inner flue therein and spaced therefrom extendand an inner flue therein and spaced there- 7:

ing from an adjacent end wall of the combustion chamber forming an air space between said flues leading from said air chamber, an air tube for a fuel nozzle extending through the other end wall of the air chamber and through the air space into an adjacent end of the combustion chamber and having an outer end spaced outwardly from the other end wall of the air chamber, a plurality of horizontal tubes extending between opposite end walls of and passing through the combustion chamber having open ends in communication with said air space, connected together walls forming a first housing at a side of the air chamber and a duct leading therefrom to a side of said air chamber adjacent said other end wall, connected together walls forming a second housing spaced outwardly from the first housing and a duct leading therefrom to the outer end of the air tube, and means for forcing air through said ducts into the air chamber and air tube, said means includingseparate air propellers in said housings and a motor connected thereto for rotating the same.

GEORGE IRVING CARTER.

REFERENCES CITED The following references are of record in the file of this patent:

2,385,652 Rifle Sept. 25, 1945 

